tv_xiaoyouxi/games/symdsb/frameworks/cocos2d-html5/CCVisibleRect.js

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/**
 * cc.visibleRect is a singleton object which defines the actual visible rect of the current view,
 * it should represent the same rect as cc.view.getViewportRect()
 *
 * @property {cc.Point}     topLeft         - Top left coordinate of the screen related to the game scene
 * @property {cc.Point}     topRight        - Top right coordinate of the screen related to the game scene
 * @property {cc.Point}     top             - Top center coordinate of the screen related to the game scene
 * @property {cc.Point}     bottomLeft      - Bottom left coordinate of the screen related to the game scene
 * @property {cc.Point}     bottomRight     - Bottom right coordinate of the screen related to the game scene
 * @property {cc.Point}     bottom          - Bottom center coordinate of the screen related to the game scene
 * @property {cc.Point}     center          - Center coordinate of the screen related to the game scene
 * @property {cc.Point}     left            - Left center coordinate of the screen related to the game scene
 * @property {cc.Point}     right           - Right center coordinate of the screen related to the game scene
 * @property {Number}       width           - Width of the screen
 * @property {Number}       height          - Height of the screen
 *
 * @class
 * @name cc.visibleRect
 */
cc.visibleRect = {
    topLeft:cc.p(0,0),
    topRight:cc.p(0,0),
    top:cc.p(0,0),
    bottomLeft:cc.p(0,0),
    bottomRight:cc.p(0,0),
    bottom:cc.p(0,0),
    center:cc.p(0,0),
    left:cc.p(0,0),
    right:cc.p(0,0),
    width:0,
    height:0,

    /**
     * initialize
     * @param {cc.Rect} visibleRect
     */
    init:function(visibleRect){
        var w = this.width = visibleRect.width;
        var h = this.height = visibleRect.height;
        var l = visibleRect.x,
            b = visibleRect.y,
            t = b + h,
            r = l + w;

        //top
        this.topLeft.x = l;
        this.topLeft.y = t;
        this.topRight.x = r;
        this.topRight.y = t;
        this.top.x = l + w/2;
        this.top.y = t;

        //bottom
        this.bottomLeft.x = l;
        this.bottomLeft.y = b;
        this.bottomRight.x = r;
        this.bottomRight.y = b;
        this.bottom.x = l + w/2;
        this.bottom.y = b;

        //center
        this.center.x = l + w/2;
        this.center.y = b + h/2;

        //left
        this.left.x = l;
        this.left.y = b + h/2;

        //right
        this.right.x = r;
        this.right.y = b + h/2;
    }
};